CN219959010U - Gradual change half tone structure of PERC battery - Google Patents
Gradual change half tone structure of PERC battery Download PDFInfo
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- CN219959010U CN219959010U CN202321263671.8U CN202321263671U CN219959010U CN 219959010 U CN219959010 U CN 219959010U CN 202321263671 U CN202321263671 U CN 202321263671U CN 219959010 U CN219959010 U CN 219959010U
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- 101001073212 Arabidopsis thaliana Peroxidase 33 Proteins 0.000 title claims abstract description 22
- 101001123325 Homo sapiens Peroxisome proliferator-activated receptor gamma coactivator 1-beta Proteins 0.000 title claims abstract description 22
- 102100028961 Peroxisome proliferator-activated receptor gamma coactivator 1-beta Human genes 0.000 title claims abstract description 22
- 230000008859 change Effects 0.000 title abstract description 6
- 238000003466 welding Methods 0.000 claims abstract description 26
- 230000007423 decrease Effects 0.000 claims abstract description 9
- 230000005540 biological transmission Effects 0.000 abstract description 9
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 229910052782 aluminium Inorganic materials 0.000 description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 230000006872 improvement Effects 0.000 description 7
- 238000002161 passivation Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- KMWBBMXGHHLDKL-UHFFFAOYSA-N [AlH3].[Si] Chemical compound [AlH3].[Si] KMWBBMXGHHLDKL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
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- Photovoltaic Devices (AREA)
Abstract
The utility model discloses a gradual change screen plate structure of a PERC battery, which comprises at least two main grids which are parallel to each other and a plurality of auxiliary grids which are parallel to each other, wherein the main grids are vertically connected with the auxiliary grids; the main grid comprises welding parts and grid line parts which are periodically and alternately arranged; the width of the auxiliary grid gradually decreases from the end part close to the main grid to the middle part far from the main grid; and/or the width of the grid line part gradually decreases from the end part close to the welding part to the middle part far away from the welding part. By adopting the gradual change screen plate structure of the PERC battery, the conversion efficiency of the battery is improved on the premise of not influencing current transmission.
Description
Technical Field
The utility model relates to the technical field of solar cells, in particular to a gradual change screen plate structure of a PERC (PERC) battery.
Background
PERC cells reduce the recombination rate of carriers on the back surface by preparing a passivation film on the back surface of the cell, thereby improving the minority carrier lifetime of the cell. The aluminum grid line structure is adopted to replace an all-aluminum back surface field, and the double-sided power generation device has the advantages of high reliability of double-glass packaging components, low aluminum paste consumption and the like.
The back grid line structure of the solar cell is generally composed of at least one main grid line and a plurality of auxiliary grid lines connected with the main grid line, wherein the main grid line and the auxiliary grid lines are generally long strips with uniform widths. In order to improve efficiency, reduce back series resistance and prevent offset in the printing process, the design of the back field screen is generally wider and better, the width of the grid line is increased, but the grid line resistance can be reduced, the contact is improved, too wide grid line can also cause contact of excessive aluminum paste and a passivation film, the passivation film structure is damaged, the open circuit voltage of a battery is influenced, and the conversion efficiency of the battery is reduced.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a gradual change screen plate structure of a PERC battery, which improves the conversion efficiency of the battery on the premise of not influencing current transmission.
In order to solve the technical problems, the utility model provides a graded screen structure of a PERC battery, which comprises at least two main grids which are parallel to each other and a plurality of auxiliary grids which are parallel to each other, wherein the main grids are vertically connected with the auxiliary grids;
the main grid comprises welding parts and grid line parts which are periodically and alternately arranged;
the width of the auxiliary grid gradually decreases from the end part close to the main grid to the middle part far from the main grid;
and/or
The width of the grid line part gradually decreases from the end part close to the welding part to the middle part far away from the welding part.
As a modification of the scheme, the width of the end part of the auxiliary grid is 130-150 mu m, and the width of the middle part of the auxiliary grid is 70-90 mu m.
As a modification of the above, the end width of the sub-gate is 140 μm and the middle width of the sub-gate is 80 μm.
As an improvement of the scheme, the main grid comprises two sub main grids which are symmetrically arranged at intervals, the sub main grids comprise sub welding parts and sub grid line parts which are periodically and alternately arranged, and the width of the sub grid line parts is gradually reduced from the end parts close to the sub welding parts to the middle parts far from the sub welding parts.
As an improvement of the scheme, the width of the end part of the sub-grid line part is 0.3-0.5mm, and the width of the middle part of the sub-grid line part is 0.1-0.3mm.
As an improvement of the scheme, the width of the end part of the sub-grid line part is 0.4mm, and the width of the middle part of the sub-grid line part is 0.2mm.
As an improvement of the scheme, the horizontal distance between the sub-grid line parts of two sub-main grids of the same main grid is D 1 The horizontal distance between the sub-welding parts is D 2 ，D 1 Less than D 2 。
As an improvement of the scheme, a hollowed-out part is arranged between the sub-welding parts of the two sub-main grids of the same main grid.
As an improvement of the scheme, the joint of the sub grid line part and the sub welding part is arc-shaped.
As an improvement of the scheme, a plurality of thin grids are arranged between the sub-grid line parts of two sub-main grids of the same main grid, and the thin grids and the corresponding sub-grids are positioned on the same straight line.
The implementation of the utility model has the following beneficial effects: by increasing the width of the grid line in the area with larger current transmission density and reducing the width of the grid line in the area with smaller current transmission density, the auxiliary grid and/or the main grid structure with gradually changed width is formed, so that the contact and current transmission can be improved while the consumption of slurry is reduced, the cost is reduced and the corrosion of aluminum slurry to a passivation film is reduced, and compared with a conventional PERC battery, the efficiency is improved by about 0.034%.
Drawings
Fig. 1 is a schematic diagram of a graded screen structure of a PERC battery provided by an embodiment of the present utility model;
fig. 2 is an enlarged view of a portion a in fig. 1.
Detailed Description
The present utility model will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present utility model more apparent. It is only stated that the terms of orientation such as up, down, left, right, front, back, inner, outer, etc. used in this document or the imminent present utility model, are used only with reference to the drawings of the present utility model, and are not meant to be limiting in any way.
As shown in fig. 1 and 2, the embodiment of the utility model provides a graded screen structure of a PERC battery, which comprises at least two main grids 1 parallel to each other and a plurality of auxiliary grids 2 parallel to each other, wherein the main grids 1 and the auxiliary grids 2 are vertically connected;
the main grid 1 includes welding portions 11 and grid line portions 12 alternately arranged periodically;
the width of the auxiliary grid 2 gradually decreases from the end part close to the main grid 1 to the middle part far from the main grid 1;
and/or
The width of the gate line portion 12 gradually decreases from the end portion near the welding portion 11 toward the middle portion distant from the welding portion 11.
By reducing the width of the grid line, the contact between the aluminum paste and the passivation film can be reduced, the damage of the aluminum paste to the passivation film is reduced, and the photoelectric conversion efficiency of the battery is improved. In addition, by providing a large gate line width in a region where the current transmission density is large, such as the end of the sub-gate 2 and/or the end of the gate line portion 12, the current transmission efficiency can be ensured, and the efficiency of the battery can be improved.
Preferably, the width of the end part of the auxiliary grid 2 is 130-150 mu m, and the width of the middle part of the auxiliary grid 2 is 70-90 mu m.
More preferably, the width of the end portions of the sub-gate 2 is 140 μm, and the width of the middle portion of the sub-gate 2 is 80 μm.
The width of the junction of the auxiliary grid 2 and the main grid 1 is larger, the reduction of the connection strength of the auxiliary grid 2 and the main grid 1 caused by the reduction of the width of the grid line is avoided, the occurrence of the phenomenon of unclear imprinting or grid breakage is avoided, the current led out from the auxiliary grid 2 can be smoothly led into the main grid 1, the string resistance of the grid line is reduced, the current leading-out quality of the solar cell is improved, and the efficiency of the solar cell is improved.
Preferably, the main grid 1 comprises two symmetrically spaced sub-main grids 13, the sub-main grids 13 comprise periodically and alternately arranged sub-welding parts 14 and sub-grid line parts 15, and the width of the sub-grid line parts 15 gradually decreases from the end parts close to the sub-welding parts 14 to the middle parts far from the sub-welding parts 14.
The interval arrangement between the sub-main grids 13, compared with the integral main grid structure, can reduce the width of the main grid as much as possible while guaranteeing the current transmission effect, thereby increasing the light receiving area of the solar cell.
Preferably, the end width of the sub-gate line part 15 is 0.3-0.5mm, and the middle width of the sub-gate line part 15 is 0.1-0.3mm.
More preferably, the end width of the sub-gate line portion 15 is 0.4mm, and the middle width of the sub-gate line portion 15 is 0.2mm.
Compared with a main grid structure with uniform width, the width of the joint of the sub-welding part 14 and the sub-grid line part 15 is larger, so that the electron collection efficiency is ensured, the conversion efficiency of the battery is improved, meanwhile, the width of the middle part of the sub-grid line part 15 is smaller, the slurry consumption is reduced, and the production cost is saved.
Wherein the horizontal distance between the sub-grid line parts 15 of two sub-main grids 13 of the same main grid 1 is D 1 Horizontal distance between sub-welds 14Leave as D 2 ，D 1 Less than D 2 。
A hollowed-out part 16 for arranging silver electrodes is arranged between the sub-welding parts 14 of the two sub-main grids 13 of the same main grid 1. The arrangement of the hollowed-out part 16 can reduce the shading area of the back electrode, improve the conversion efficiency of the solar cell, reduce the use amount of conductive paste and reduce the manufacturing cost of the solar cell.
The junction of the adjacent sub-gate line portion 15 and the sub-welding portion 14 is arc-shaped. The arc-shaped connection part can further reduce the aluminum paste consumption on the premise of not influencing the electron transmission efficiency, thereby reducing the back electrode unit consumption.
A plurality of thin grids 17 are arranged between the sub-grid line parts 15 of the two sub-main grids 13 of the same main grid 1, and the thin grids 17 and the corresponding sub-grids 2 are positioned on the same straight line. The provision of the fine grid 17 can increase the aluminium silicon contact of the region between the sub-main grids 13, thereby improving the efficiency of the solar cell.
In addition, the number of the main grids 1 and the auxiliary grids 2 can be selected according to the design requirements of the solar cell.
While the foregoing is directed to the preferred embodiments of the present utility model, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the utility model, such changes and modifications are also intended to be within the scope of the utility model.
Claims (10)
1. The graded screen plate structure of the PERC battery is characterized by comprising at least two main grids which are parallel to each other and a plurality of auxiliary grids which are parallel to each other, wherein the main grids and the auxiliary grids are vertically connected;
the main grid comprises welding parts and grid line parts which are periodically and alternately arranged;
the width of the auxiliary grid gradually decreases from the end part close to the main grid to the middle part far from the main grid;
and/or
The width of the grid line part gradually decreases from the end part close to the welding part to the middle part far away from the welding part.
2. The graded screen structure of the PERC battery of claim 1, wherein the end width of the sub-grid is 130-150 μm and the middle width of the sub-grid is 70-90 μm.
3. The graded screen structure of the PERC battery of claim 2, wherein the end width of the sub-grid is 140 μm and the middle width of the sub-grid is 80 μm.
4. The graded screen structure of a PERC battery according to claim 1, wherein the main grid comprises two sub-main grids symmetrically arranged at intervals, the sub-main grids comprise sub-welded parts and sub-grid line parts which are periodically and alternately arranged, and the width of the sub-grid line parts is gradually reduced from the end parts close to the sub-welded parts to the middle parts far from the sub-welded parts.
5. The graded screen structure of the PERC battery of claim 4, wherein the end width of the sub-grid line part is 0.3-0.5mm, and the middle width of the sub-grid line part is 0.1-0.3mm.
6. The graded screen structure of the PERC battery of claim 5, wherein the end width of the sub-grid line part is 0.4mm, and the middle width of the sub-grid line part is 0.2mm.
7. The graded screen structure of a PERC battery according to claim 4, wherein a horizontal distance between the sub-grid line portions of two sub-main grids of the same main grid is D 1 The horizontal distance between the sub-welding parts is D 2 ，D 1 Less than D 2 。
8. The graded screen structure of the PERC battery of claim 4, wherein a hollowed-out portion is provided between the sub-welded portions of two sub-main grids of the same main grid.
9. The graded screen structure of the PERC battery of claim 4, wherein the junction of the sub-grid line portion and the sub-welding portion is arc-shaped.
10. The graded screen structure of a PERC battery according to claim 4, wherein a plurality of fine grids are provided between the sub-grid line portions of two sub-main grids of the same main grid, the fine grids and the corresponding sub-grids being positioned on the same straight line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321263671.8U CN219959010U (en) | 2023-05-23 | 2023-05-23 | Gradual change half tone structure of PERC battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321263671.8U CN219959010U (en) | 2023-05-23 | 2023-05-23 | Gradual change half tone structure of PERC battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219959010U true CN219959010U (en) | 2023-11-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321263671.8U Active CN219959010U (en) | 2023-05-23 | 2023-05-23 | Gradual change half tone structure of PERC battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219959010U (en) |
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2023
- 2023-05-23 CN CN202321263671.8U patent/CN219959010U/en active Active
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